1 Features

1• Single Address Pin Offers Choice of Three

Selectable Addresses Per Version for a Total of

Six Possible Addresses.

• SMBus and I2C-compatible Two-Wire Interface

• Supports 400-Khz Operation

• Shutdown Mode With One-shot Feature Available

for Very Low Average Power Consumption

• Programmable Digital Temperature Resolution

From 11 Bits to 14 Bits

• Fast Conversion Rate Ideal for Quick Power Up

and Measuring Rapidly Changing Temperature

• Open-Drain ALERT Output Pin Goes Active When

Temperature is Above a Programmed

Temperature Limit

• Very Stable, Low-noise Digital Output

• UL Recognized Component

• Key Specifications

– Supply Current

– Operating

– 320 μA (Typical)

– 495 μA (Maximum)

– Shutdown

– 8 μA (Maximum)

– 1.9 μA (Typical)

– Temperature Accuracy

– −10°C to 80°C: ±1.0°C (Maximum)

– −25°C to 115°C: ±1.5°C (Maximum)

– −40°C to 150°C: ±2°C (Maximum)

– Resolution

– 0.25°C to 0.03125°C

– Conversion Time

– 11-Bit (0.25°C): 14 ms (Maximum)

– 14-Bit (0.03125°C): 112 ms (Maximum)

2 Applications

• Portable Electronics

• Notebook Computers

• Automotive

• System Thermal Management

• Office Electronics

3 Description

The LM73 is an integrated, digital-output temperature

sensor featuring an incremental Delta-Sigma ADC

with a two-wire interface that is compatible with the SMBus and I2C interfaces. The host can query the

LM73 at any time to read temperature.

Available in a 6-pin SOT package, the LM73 occupies

very little board area while operating over a wide

temperature range (–40°C to 150°C) and providing

±1°C accuracy from –10°C to 80°C. The user can

optimize between the conversion time and the

sensitivity of the LM73 by programming it to report temperature in any of four different resolutions.

Defaulting to 11-bit mode (0.25°C/LSB), the LM73

measures temperature in a maximum time of 14 ms,

making it ideal for applications that require

temperature data very soon after power-up. In its

maximum resolution, 14-bit mode (0.03125°C/LSB), the LM73 is optimized to sense very small changes in

temperature.

A single multi-level address line selects one of three

unique device addresses. An open-drain ALERT

output goes active when the temperature exceeds a

programmable limit. Both the data and clock lines are

filtered for excellent noise tolerance and reliable

communication. Additionally, a time-out feature on the

clock and data lines causes the LM73 to

automatically reset these lines if either is held low for

an extended time, thus exiting any bus lock-up

condition without processor intervention.